1. Demo- Human earphones (Dichotic listening)
Hearing
Demo- Human earphones
(Dichotic listening)

2. Characteristics of Sound
SOUNDS WAVES
VARY IN: Which Affect:
Amplitude Loudness
Wavelength
(frequency) Pitch

3. Oooooohhhh,…. pictures

4. Frequency of Sound Waves
The frequency of a sound wave is measured as the number of cycles per second (Hertz)

5. Sound waves Demo… Are there some frequencies we can’t hear?
(Ring tones demo)

6. Anatomy of Ear Purpose of the structures in the ear is to measure…
the frequency (pitch) of sound waves
the amplitude (loudness) of sound waves

7. Step One: Outer Ear

8. Step Two: Middle Ear

9. Step Three : Inner Ear

10. Entire Process

11. How does the ear hear? Ear Animation

12. Theories of hearing…
FREQUENCY THEORY= the rate of vibration of hair cells in cochlea determine pitch.

13. How do we hear pitch or tone?
PLACE THEORY = The hair cells in your cochlea respond to different sounds based upon location.
Some respond to High Pitch
Some to Low Pitch

14. I am the master at opening traps!!
How do I remember?
I am the master at opening traps!!
All Eager Hamsters and Squirrels open closed traps always
Auditory Canal…Eardrum… Hammer….Anvil…Stirrup… Oval Window…Cochlea… Transduction… Auditory Nerve
ME TOO!

15. Wrap up and review
Review of S/P & Thresholds
JND
Apply

16. Thresholds…
Difference Threshold- A “ just noticeable” difference( jnd) between two stimuli. It is the minimum difference perceivable between two stimuli.
Weber’s Law

17. Thresholds… Sub threshold Absolute Threshold Difference Threshold
A woman tries to use Spanish- “while she sleeps”
A sentry on night duty notices a soft noise and call out “halt”
A father takes his children to the playground. During the visit a child start to cry. Without looking, the father can tell it is not his child’s cry.

18. Sub threshold Absolute Threshold Difference Threshold
There is a sale on 5 pound sacks of potatoes . In order to make sure you get the most for your money, you pick up several to see which is the heaviest.
You help your friend look for the contact lens on her white kitchen floor.
A music group records “ buy our tapes” backwards on one of their songs.